This is an Airtronics RX-471W 2.4GHz
4-Channel FH3/FH4 Super Response Waterproof Receiver. The RX-471W Super
Response waterproof receiver is compatible with Airtronics 2.4GHz FH3
and FH4T transmitters, such as the M12, MT-4S, MT-4, MX-3X, M11X, EXZES X
and others. This 4-channel receiver features an extremely low latency
time and high frame rate, which makes you feel more connected to your
model than ever. Combined with Airtronics' specially made Super Response
servos, the RX-471W Super Response receiver will give you reaction
speeds like never before!

Features:

• Compatible with All Airtronics and Sanwa 2.4GHz FH3 and FH4T Surface Transmitters